<template>
  <div class="app-container">
    <el-form label-width="120px">

      <el-form-item label="信息描述">
        <el-tag type="info">excel模版说明</el-tag>
        <el-tag>
          <i class="el-icon-download"/>
          <a href='../../../../static/example.xlsx'>点击下载模版</a>
        </el-tag>
      </el-form-item>

      <el-form-item label="选择Excel" class="chooseEx">
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :limit="1"
          :action="BASE_API+'/education/edu-subject/uploadSubject'"
          name="file"
          accept="application/vnd.ms-excel">

          <el-button slot="trigger" size="small" type="primary">选取文件</el-button>

          <el-button
            :loading="loading"
            style="margin-left: 10px;"
            size="small"
            type="success"
            @click="submitUpload">{{ fileUploadBtnText }}
          </el-button>
        </el-upload>
      </el-form-item>

    </el-form>
  </div>
</template>

<script>
  export default {
    name: "Save",
    data() {
      return {
        BASE_API: process.env.BASE_API, // 接口API地址
        fileUploadBtnText: '上传到服务器', // 按钮文字
        importBtnDisabled: false, // 按钮是否禁用,
        loading: false,
      }
    },
    methods: {
      // 点击提交按钮
      submitUpload() {
        this.fileUploadBtnText = '正在上传';
        this.importBtnDisabled = true;
        this.loading = true;
        this.$refs.upload.submit();
      },
      // 上传成功的回调函数
      fileUploadSuccess(response) {
        this.fileUploadBtnText = '导入成功';
        this.loading = false;
        this.$message({
          type: 'success',
          message: response.message
        });
        // 导入课程列表成功后跳转到课程列表页面
        this.$router.push({path: "/subjectList"})
      },
      // 上传失败的回调函数
      fileUploadError() {
        this.fileUploadBtnText = '导入失败';
        this.loading = false;
        this.$message({
          type: 'error',
          message: '导入失败'
        })
      }
    }
  }
</script>

<style scoped>
  .chooseEx {
    margin-left: 10px;
  }

</style>
